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Does Cloudflare block Tor?

Cloudflare does not automatically block visitors who use the Tor network. You can control Tor access via the Firewall app and enable Onion Routing in the Crypto app.

Why might a Tor visitor be blocked or challenged?

Due to the behavior of some individuals using the Tor network (spammers, distributors of malware, attackers, etc.), the IP addresses of Tor exit nodes may earn a bad reputation, elevating their Cloudflare threat score.

Our basic protection level issues CAPTCHA-based challenges to visitors whose IP address has a high threat score, depending on the level chosen by the Cloudflare customer. The choices for security range from Essentially Off to I'm Under Attack. The default level is Medium.

What additional control do Cloudflare customers have over traffic from visitors using Tor?

Since February 2016, Cloudflare treats Tor exit nodes as a "country" of their own. There's no geography associated with these IPs, but this approach lets Cloudflare customers override the default Cloudflare threat score to define the experience for their Tor visitors.